Hybrid-type synchronous machine

a synchronous machine and hybrid technology, applied in the direction of windings, synchronous machines with stationary armatures and rotating magnets, dynamo-electric components, etc., can solve the problems of torque decrease, loss due to d-axis current, and decrease in the amount of magnetic flux of the magnet that crosses the stator coil, so as to reduce the effect of d-axis current loss, increase the field magnetic flux, and reduce the effect of efficiency

Inactive Publication Date: 2009-12-03
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0013]Since the excitation coil and the permanent magnet are arranged in series in the flux path of the field magnetic flux, the field magnetic flux can be increased without energizing the excitation coil in a mode that magnetism is not increased or decreased. That is, since loss of excitation current is not caused in an operation mode, in which the magnet magnetic flux is used to the maximum extent, the decrease in efficiency caused thereby can be minimized. For example, in an electric motor for a vehicle, the rotation speed of the rotor is not so large in most of its operation period, and no magnetization decreasing control is necessitated. Therefore, the magnetization l

Problems solved by technology

However, if the d-axis current is reduced, loss due to the d-axis current is large.
As a result, the amount of magnetic flux of the magnet that crosses the stator coil decreases and hence to

Method used

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first embodiment

[0021]A hybrid excitation-type synchronous machine according to a first embodiment will be described with reference to FIGS. 1 and 2.

[0022]Referring to FIG. 1, a motor frame 1 supports a stator 2. The stator 2 includes a stator core 3 and a stator coil 4. The stator core 3 is made of a cylindrical soft magnetic member fixed to the inner peripheral surface of the motor frame 1. The stator coil 4 is wound on the stator core 3. A rotor core 5 is press-fitted and fixed to a rotation shaft 6 and accommodated radially inside the stator core 3. A pair of stationary magnetic path members 7, a pair of excitation coils 8 and eight permanent magnets 9 fitted to the rotor core 5 are provided. A small gap is provided between the outer peripheral surface of the rotor core 5 and the inner peripheral surface of the stator core 3.

[0023]The pair of the stationary magnetic path members 7 is separately fixed to end surfaces of the motor frame 1 and face the rotor core 5 with small gaps relative to the ...

second embodiment

[0034]The hybrid excitation-type synchronous machine according to a second embodiment is different from the first embodiment in that, as shown in FIG. 4, the stationary magnetic path member 7, the inner cylindrical part 51 and the axial magnetic path member 53 have different shapes. Specifically, the inner cylindrical part 51 and the axial magnetic path member 53 protrude more in the axial direction than in the first embodiment and face the peripheral surface of the cylindrical stationary magnetic path member 7 with small gaps in the radial direction. Thus, magnetic attraction force between the inner cylindrical part 51, the axial magnetic path member 53 and the stationary magnetic path member 7 works in the radial direction. As a result, the axial thrust working on the rotor core 5 can be reduced.

third embodiment

[0035]The hybrid excitation-type synchronous machine according to a third embodiment is different from the first embodiment in that, as shown in FIG. 5, the stationary magnetic path member 7 has different shape. Specifically, the stationary magnetic path member 7, which is soft magnetic, is formed of spirally-wound steel plate parts 72 and 73. However, the entire shape of the stationary magnetic path member 7 according to the third embodiment is generally the same as that of the stationary magnetic path member 7 according to the first embodiment. The spirally-wound steel plate part 72 is located outside the excitation coil 8 in the radial direction and formed by spirally winding a thin electromagnetic belt steel plate. The spirally-wound plate part 73 is located inside the excitation coil 8 in the radial direction and formed by spirally winding a thin electromagnetic belt steel plate. According to this configuration, the eddy current in the stationary magnetic path member 7 can be r...

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Abstract

A rotor core has permanent magnets. Magnetic flux of the permanent magnet of an even-numbered rotor magnetic pole part is guided in an axial direction by an axial magnetic path member. Magnetic flux of the permanent magnet of an odd-numbered rotor magnetic pole part is guided into a soft magnetic inner cylindrical part. The axial end faces of the inner cylindrical part and the axial magnetic path member protrude from the rotor core in the axial direction and face a stationary magnetic path member with a small gap therebetween. The amount of magnetic flux of the magnet, which the permanent magnet applies to a stator core is adjusted by an excitation current of an excitation coil wound on the stationary magnetic path member.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2008-144712 filed on Jun. 2, 2008.FIELD OF THE INVENTION[0002]The present invention relates to a hybrid excitation-type synchronous machine, which includes a field coil and permanent magnets to generate field magnetic flux of a rotor.BACKGROUND OF THE INVENTION[0003]A synchronous machine includes a field coil-type synchronous machine, a permanent magnet-type synchronous machine and a reluctance motor. In the field coil-type synchronous machine, field magnetic flux of a rotor is generated by an excitation coil (field coil). In the permanent magnet-type synchronous machine, magnet flux generated by permanent magnets is used as filed magnetic flux. In the reluctance motor, reluctance torque is generated by magnetic resistance variation of a salient pole-type rotor core, which rotates relative to a salient pole-type stator core.[0004]The permanent...

Claims

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Application Information

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IPC IPC(8): H02K21/04
CPCH02K21/14H02K21/04
Inventor KINJOU, HIROFUMIONIMARU, SADAHISA
Owner DENSO CORP
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